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[TIGGE #YSF-211129]: TCP tuning for TIGGE tuning
- Subject: [TIGGE #YSF-211129]: TCP tuning for TIGGE tuning
- Date: Tue, 13 Feb 2007 11:22:53 -0700
Hi YangXin,
Thanks for the update regarding the new hardware you're using. Please let us
know the output from "uname -a"
Network performance tuning can cause unexpected problems, so we'll try changing
only the variables that will
give you the largest improvements. Try adding the following to
/etc/sysctl.conf and running "sysctl -p"
after the changes are made;
net.core.rmem_max = 1000000
net.core.wmem_max = 1000000
net.ipv4.tcp_rmem = 4096 524288 2000000
net.ipv4.tcp_wmem = 4096 65536 2000000
Afterwards, please stop and re-start the LDM. That should make a noticable
improvement to performance.
If for some reason it seems to make performance worse, change the vaules in
/etc/sysctl.conf back to the
default and re-run "sysctl -p" Let me know if that works or if it doesn't
mike
> Hi, Steve,
>
> The current platform for TIGGE Data Exchange in CMA is a IBM x3850 equipped
> with 2 2-core processors and 4GB memory,
> running RHEL4 update 4. As you suggested, TCP Tuning should have significant
> impact to the efficiency of data transfer,
> I'd like to do some test to change the important kernel parameters, see if
> the performance can be improved and less
> data will be lost.
>
> I'm sorry that I don't have a deep understanding on network performance
> tuning, so I have to check some books and
> materials to find out what is the critical factor to the networking system.
> I've found serveral parameters that
> probably have impact on TCP performance, but I'm not very sure what value is
> best for LDM to work for our platform.
> These parameters with the default value in our platform are as follows:
>
> net.ipv4.tcp_tw_reuse = 0
> net.ipv4.tcp_tw_recycle = 0
>
> net.ipv4.tcp_fin_timeout = 60
>
> net.ipv4.tcp_max_syn_backlog = 1024
>
> net.ipv4.tcp_rmem = 4096 87380 174760
> net.core.rmem_default = 135168
> net.core.rmem_max = 135168
>
> net.ipv4.tcp_wmem = 4096 16384 131072
> net.core.wmem_default = 135168
> net.core.wmem_max = 135168
>
>
> I believe there must be some other parameters that are important to TCP
> Tuning. I only enabled
> first two parameter by setting them as follows:
> net.ipv4.tcp_tw_reuse = 1
> net.ipv4.tcp_tw_recycle = 1
>
> and then restarted LDM.
>
> Is it appropriate, do I need to set any other parameters?
>
> Thank you.
>
> YangXin,
> Feb 13.
Ticket Details
===================
Ticket ID: YSF-211129
Department: Support IDD TIGGE
Priority: High
Status: Closed